A loop of wire with a radius of $2.0\mathrm{cm}$ lies in the $xy$ -plane and is centered on the origin. It carries a counterclockwise current of $1.0$ A when viewed from above the $xy$ -plane. A long, straight wire lies along the line $y=-2.0\mathrm{cm}$. so that it is tangent to the lowest point on the loop. This straight wire carries a current of $1.0\text{A}$ in the negative x-direction. What is the strength of the magnetic field at the center of the loop?

• A. $21\mu \mathrm{T}$ in / below the $xy$-plane
• B. $41\mu \mathrm{T}$ out / above the $xy$-plane
• C. $41\mu \mathrm{T}$ in / below the $xy$-plane
• D. $63\mu \mathrm{T}$ out / above the $xy$-plane
• E. $63\mu \mathrm{T}$ in / below the $xy$-plane
• F. $21\mu \mathrm{T}$ out / above the $xy$-plane